桂林理工大学学报2016，Vol.36Issue(4)：707-712,6.DOI:10.3969/j.issn.1674-9057.2016.04.010
混凝土桥梁加宽改造后下部结构时变可靠性分析
Time-dependent reliability of the substructure for widened concrete girder bridges
摘要
Abstract
This paper studies the shrinkage and creep difference of concrete and foundations settlement difference between the old and new structure on the reliability index of widened bridge substructure.The research was carried on a widened prestressed concrete simply supported-to-continuous T-girder bridge with the span of 4 × 25 m,which was built 15 years ago,and expected to go on 85 years working after widened.Then we set up space beam grillage model by Midas and Matlab Software to analyze the time-dependent reliability of the bridge substructure before and after widened.The results showed that the index of time-dependent reliability of the bridge substructure decreased 16.20％ if only considered the difference of shrinkage of concrete and creep after being operated for 85 years.The index of time-dependent reliability of the bridge substructure decreased 32.59％ when further considered the foundations settlement difference between the old and new structure.关键词
混凝土桥梁/加宽改造/收缩徐变差/基础沉降差/时变可靠度Key words
concrete bridge/widening transformation/shrinkage and creep difference/foundations settlement differences/time-dependent reliability分类
交通工程引用本文复制引用
方志,董华平..混凝土桥梁加宽改造后下部结构时变可靠性分析[J].桂林理工大学学报,2016,36(4):707-712,6.基金项目
国家自然科学基金项目(51278182) （51278182）
